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Required equipment for Invertec V350 tig setup

Hey all,

I have a V350 Pro Factory model around the 2000 model year. Did they all come equipped with the gas solenoid for tig or is this something I need to buy? Lincoln says twist-mate models are able to pass the gas through the twist lock connection? Is that applicable to older inverter machines as well?

Aside from the flowmeter, foot pedal and torch, is there anything else needed to get set up for lift start tig?

Re: Required equipment for Invertec V350 tig setup

Thanks. Good point. The power supply definitely does not have a gas inlet on it.

I have a Invertec V250-S, was building a stainless steel smoker, got tired of the valved torch and wanted to have an adjustable postflow timer.

I put together a standalone unit triggered by a second micro switch added to the K-870 foot pedal. There are no connections to the internals of my welder. I'd be happy to share the details if you have an interest.

Re: Required equipment for Invertec V350 tig setup

I'm not terribly familiar with the Invertec, but aren't they DC only machines? If so I'd get a torch with a valve and get to welding. I'd prolly have to play around with that lift arc to get familiar with it.

Re: Required equipment for Invertec V350 tig setup

Just get a torch with a gas valve and go to it. There's no hf start on these and they are dc only. The invertec v350 is one of the finest multiprocess power supplies on the market today. They are wonderful stick welders and wire welders with an external feeder. An LN25 makes a great feeder to run wire with the v350.
The v350 is also very good at carbon arc air gouging.
You can really do it all with one of these machines. Just no high frequency ac tig.

Re: Required equipment for Invertec V350 tig setup

I've often thought about doing one like that and including a contactor too. I'd be interested in seeing what you did.

I started off with a 12 volt gas solenoid that I got from a welder repair shop.

After reviewing the schematics of the welder I couldn't find a location to tap off of to get the voltage I needed so I used a 12 volt power source I've had for 30 years. I also didn't want to use the existing micro switch in the foot pedal and risk blowing something up in the welder so I opened up the fit pedal and bolted a second microswitch on the opposite side of the factory switch.

I picked up some repurposed Anti 2 Block coaxial cable from a Grove crane and fed that in through the strain relief on the foot pedal and wired it up to the new switch. I used a bunch of heat shrink tubing and fastened the small cable to the length of the foot pedal cable.

I issued an Uxcell 4 pin aviation connector at the connection to the solenoid so I could disconnect the foot pedal completely.

I ordered a countdown timer in the .3-30 second range and a 11 pin Octal base to mount it on. I mounted these on one side of a piece of scrap aluminum and the gas solenoid on the other side then zip tied it to the carrying handle on the welder.

I was overly worried about backfeeding anything into the welder, so I fed positive and ground into a DPDT relay that I had laying around which then in turn feed the countdown relay.

Re: Required equipment for Invertec V350 tig setup

Originally Posted by p_sneadly

I started off with a 12 volt gas solenoid that I got from a welder repair shop.

After reviewing the schematics of the welder I couldn't find a location to tap off of to get the voltage I needed so I used a 12 volt power source I've had for 30 years. I also didn't want to use the existing micro switch in the foot pedal and risk blowing something up in the welder so I opened up the fit pedal and bolted a second microswitch on the opposite side of the factory switch.

I picked up some repurposed Anti 2 Block coaxial cable from a Grove crane and fed that in through the strain relief on the foot pedal and wired it up to the new switch. I used a bunch of heat shrink tubing and fastened the small cable to the length of the foot pedal cable.

I issued an Uxcell 4 pin aviation connector at the connection to the solenoid so I could disconnect the foot pedal completely.

I ordered a countdown timer in the .3-30 second range and a 11 pin Octal base to mount it on. I mounted these on one side of a piece of scrap aluminum and the gas solenoid on the other side then zip tied it to the carrying handle on the welder.

I was overly worried about backfeeding anything into the welder, so I fed positive and ground into a DPDT relay that I had laying around which then in turn feed the countdown relay.

Re: Required equipment for Invertec V350 tig setup

Originally Posted by p_sneadly

I have a Invertec V250-S, was building a stainless steel smoker, got tired of the valved torch and wanted to have an adjustable postflow timer.

I put together a standalone unit triggered by a second micro switch added to the K-870 foot pedal. There are no connections to the internals of my welder. I'd be happy to share the details if you have an interest.

Sent from my iPhone using Tapatalk

Here's the business end of it. I relocated the gas solenoid this morning.

I found that when the magnetic field collapsed in the gas solenoid it would re-energize the delay timer and never shut the gas off. I added a small pilot light in parallel to gas solenoid circuit and that took care of the issue.

Re: Required equipment for Invertec V350 tig setup

Originally Posted by hillbillyfab

I'm not terribly familiar with the Invertec, but aren't they DC only machines? If so I'd get a torch with a valve and get to welding. I'd prolly have to play around with that lift arc to get familiar with it.

Yes DC only. I have not tried lift arc, only HF start a bit. It will be nice to have the foot pedal to turn off the arc rather than breaking the arc and going back in for post flow.